Tests and diagnosis

As part of a physical examination, your doctor will likely examine your (or your son's) genital area and chest and may do tests to check reflexes and mental functioning.

The main tests used to diagnose Klinefelter syndrome are:

Hormone testing. Blood or urine samples can reveal abnormal hormone levels that are a sign of Klinefelter syndrome. The doctor may take samples to be evaluated in the lab.

Chromosome analysis. Also called karyotype analysis, this test is used to confirm a diagnosis of Klinefelter syndrome. It's usually done by taking a blood sample for laboratory examination to check the shape and number of chromosomes.

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